It is better to study a lot of subjects at school or to choose one to concentrate deeply.
There are two controversial opinion of studying school subjects.
No one can deny that specialisation in the particular field of klowledges if very good thing. It goes without saying that so called narrow spesialists with deep and strong experience in their area of activity are quite valuable for the companies. They usually work in very important positions in the personal offices or laboratories, have excellent work condition, long term contract with famous and respectable companies, let alone the big wages and range of bonuses. They reach some outstanding results and often become autors of breakthroughs in their fields.
In a word, deep concentration and specialisation in a work activity would be absolutely perfect idea as long as we have a deal with growns up.
Nonetheless this educational strategy is unacceptable for school children.
As a matter the fact is school students don't have any defined vision of their future, their special abilities, talants and so on. As a result of narrow education technology (NET) they can choose their development parth incorrectly under compulse of emotions or some another factors. Thus they might spend years studying subjects they are not interested in. This is a way to some learning difficulties, depression or even mental problems.
Pondering options of educational strategies I have came to conclusion that NET have more negative factors than wide range education (WRE). In my opinion this is the only way to discover pupil's special nature abilities, interests, gifts and choose appropriate area for further specialisation at a university or colleges.